blessing



I. G. BLESSING.

' SAILING DEVICE FOR AUTOMATIC TELEPHONE SYSTEMS.

VM rucmmn man Nov.22. 19|s.

1 ,3 1 7, 1 52 Patented Sept. 30, 1919.

2 SHEETS-SHEET I.

APPLICATION FILED NOV. 22,1916- Patented Sept. 30,1919.

ZYSIIEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

l JOHN G. IBLESSING, OF CHICAGC, ILLINOIS, ASSIGNOR TOAUT'OMATICVELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0FILLINOIS.

CALLING DEVICE FOR AUTOMATIC TELEPHONE SYSTEMS.

To all whom it may concern:

Be it known that I, JOHN G. BLussING, a citizen ol the United States ofAmerica', and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements in CallingDevices for Automatic Telephone Systems of which the follmving is aspecification.

lii y invention rela-tes in general to calling devices, or impulsesenders as they are sometimes termed, for use at the substations in anautomatic Jtelephone system, and the principal object of the inventionis to coinbine a calling device and a desk telephone in one instrumentin order to form a more compact and eilicient substation set than hashitherto be-en available.

The foregoing and other useful objects are attained in a manner andthrough means lwhich will be fully described and explained hereinafterreference being had to the aeconipanying drawings.

In the drawings, Figure 1 is a vertical cross section of a desk typetelephone embodying the princi ples of my invention, Fig. 2 is ahorizontal cross section taken on the line Z, Fig. 3 shows a mountingplate contained in the base and carrying the impulse sending mechanismproper, Figs. 4 and 5 show details of the said mechanism, Fig. 6 is afront view in perspective showing the sliding finger hole dial, Fig. 7is a detail shdwing of the dial locking device, and Fig. 8 is a circuitdiagram.

Referring now particularly to Figs. 1, 2, and 7, the base 2 ispreferably a metal stamping of the form shown in Fig. 1. heavy metalring 9, which is turned down to a smaller diameter at its upper end, hasits lower end fitted inside the base and secured thereto by brazing.Theupright frame is made of a: tube 8 which is fitted over the upper endof the ring 9 and which is also brazed or soldered to the ring. The tube8 is cut away in front and in back leaving only two upright portions 13and 14, seen clearly in Fig. 7, which support at the to a transmitterhead 5. A plate 15 exten s from the ring 9 to the transmitter head 5 andis in line with the front edges of the uprights 13 and 14, to which itmay be soldered or brazed, and which in addition to strengthening theframe, afords a means for mounting the receiver hook and also serves asa Specileation of Letters Patent.

Patented Sept. 30, 1919.

runway for the slidable linger hole dial, as will appear more clear] yhereinafter.

The slidable setting member, herein for convenience termed a dial,comprises a curved segmentl'?, which is cut from a tube of slightlysmaller diameter than the tube 8, and which is secured to two metalblocks 18 and 19. The back plate 20 is secured to the blocks 18 and 19by short screws two of which may be seen in Fig'. 1. A glass plate 21 isclamped between the blocks 18 and 19 and the back plate 20 and hasaffixed to its rear surface a card bearing the usual. series of digitsfrom 1 to 0. The dial as a whole is adapted to slide up and down betweentwo flanges 6 and 1G on the plate 15, a segment of the ring 9 beingl cutaway at il 1 to permit the lower end of the dial to pass through. Thedial is held in place by the outer tube 4 which fits closely over thatportion of the tube 8 which has not been cut away and which has anopening in front of the dial, as is'best seen in Fig.' 6. The outercasing is completed by the cap 24 which fits down over the transmitterhead 5 and the tube 4.

The receiver hook passes through a slot in the cap 24 and is pivoted tothe plate 15 by means of a screw 32. Just inside the cap 24 the hookrests on a lug 33 attached to a vertically slidable rod 34 by means ofwhich the ntaet springs 3G, ,37, and 38 are controlled. The lower end ofthe rod 34 is turned down as at 39 and passes through a hole in the rin9. When the receiver is removed the hoo i is raised under the influenceof a spring which is compressed between the larger diameter of the rod34 and the ring 9.

Referring now more particularly to Figs. 3, 4, and 5, the base plate 3may be mounted within the base 2 in any suitable manner, being, howeverpreferably secured to the ring 9 by means of two screws 40 and 41. Thesenneireular fiber ring 44 carries the terminals 45 which afford a meansfor connecting the conductors of the usual flexible cord with theinstrument wiring. Also mounted on the plate 3 are the impulse springs42 Aand 43 and the hook springs 36, 37 and 38. The mechanism forcontrolling the impulse springs 42 and 43 comprises a shaft 48 which isclamped between the mem bers 46 and 47 and secured 4to the plate 3 bymeans of screws 54 and 55. The shaft 48 b elcesiwtieii werme- 'be t thesaid ring.

carries n drum wheel 49 which has u hub 50 nponwvhichis mounted n. looseratchet Wheei 51. The fiber impulse Wheel is rigidly secured -to theratchet 51. Motion -is transmitted from the drum Wheel 49 to the imulseWheel 52 by means of a, pawl 54 which 1s adapted to engage'the teeth inthe ratchet 51. The relation of these pnrts may be readily Yunderstoodfrom. Fig. 5. The dru-ni wheel 49 is hollow und contains ir clock spring53 which is fa'st'ened t one end to the shaft 48 and et the other end tothe wheel-49.

The yimpulse sendin mechanism which has 'justibeendes'biib is controlledor set tliefslidihg-dil throii h 'connecting dey scribedv yIn 1isfseeifef cylinderf which 'passes througi the 'hble in riiigali'd"'is"sui`te'bly secured Between 4.the cylinder 56 and the plate 15there is slidably mounted 'firr'ieiriber 27 which has at its upperend nright angle bend i'secnred to the hub 26, end t'its lovveilend'zrtongiie which pro e'cts :throught slot 7 in the plete 15 en"supports'the finger hole 'dinlll Lateral movement' of the member 27above is preventedb'y the erosspiece 57, shown in QFig. 7; 'slot 12 iseut-"in ring '9' to permit the passagcoffthe tongue"29. Motionisenihunietedfrom the slidi member 27 and mechanical relation of thevarious parts oi my improved ceiling device, l will now proceed toexplain the iminner in which tlnl seine is operated.

The function of u. device of thisI rlniratcter, :is is Well known, is toproduce series o-IE breaks or interruptions in the sulisi'ntion linecircuit corresponding to the difi'in'ent digits in :L called number.Bearing this feet in mind und with occasional references to the circuitdiagram of Fig. is, the explanation of the operation muy be proceededwith.

W hen the receiver is on'the hook, which is theiiorrnel condition, thecontact s rings 37 'zi-ndBS :trein enga ement, wherey the ringer Klisconnected in'bridge of the line conductors 71,es see'n in.Fig. 8.Vlfheiiiin'4 this conditionV the substation is ready to receive calls.

When the receiver is removed to initiate :L cell, the rod 34 is raisedby the spring 35, whereby the Contact springs 37 and 38 nre seperated:ind the former spring brought into engagement with Contact spring 3G.As the result of the shifting of these Contact springs the ringer K isdisconnected and the seriell)v connected receiver R and transmitter Tere bridged across the line conductors in the lusuel manner. In additionto shifting the switching Springs, the rod 34, by means of tl 'e lug 33,disengages the lever 61"of the dial locking device the projection 63.The removal of the receiver, then, places the circuits et the substation'in condition for talking and" unlocks the dial. At the eziehange, inthe vmore g'enerally 'used systems, the"1eni0val"of the receiver at' oneof the substations is followed by` the'automatic operation ofpreliminary trunking eppnretus whereby the calling 'line is eXtended'toan idle selector switch.

The calling subscriber will non7 proceed to Amanipulate his callingdevice in accordance with the first digit of the desired number, whichwill be assumed to 'be the digit 5. `The operati-on is'as follows: Thelinger is placed in the finger hole of the dial corresponding tothedigit 5 and the dial is pulled down until thefinger strikes the stop80,"after which the linger is Wi'th'- drewn to permit the dial to returnto normal. When the dial is pulled down it cerres with it the slidingmember 27',V whichin turn, operates to, unwind the steel ribbon 28 rfromthe drum'irvheel 49, thereby turnu ing the latter to tension the clockspring 5'3. Additionally 'the piston 25 i's forced down in the cylinder56 end'some of the air in' the cylinder i's'fforeed out ast the taperedscrew 60. The' drum whee 4'9`is of rsuch diameter thttt when (the dialis ulled for the"'di'git 5 thes'eid wheel' Will be rotated bylthlunwlndiig" of""the" Iibbon 28 e suiiicnt distnce'to eeuse'the awl 54to pesve teethf'the retehet whee 51. New

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when the dial is released by the linger of the operator, the drum wheel49 is returned to normal by the clock sprin 53, thereby winding up theribbon 28 an raising the dial until the tongue 29 reaches the top of theslot 7. As the drum Wheel returns to normal the pawl 54 engages the lasttooth of the ratchet wheel past which it 'was rotated whence it followsthat the return movement of the drum Wheel is accompanied by therotation of the ratchet wheel. Since the teeth on the impulse wheel 52are spaced the same as the teeth on the ratchet wheel 5l it will beobvious now that on the return of the drum wheel to normal the impulsewheel will separate the impulse springs l2 and 43 five times to causetive brea s or interruptions in the line circuit. The speed at which theimpulses are transmitted may be varied by adjusting the tapered screw 60which regulates the admission of air to the cylinder 56.

The selector switch at the exchange having operated responsive to theinterruptions just produced in the line circuit, the calling subscribermay now proceed to manipulate his calling device in accordance Withsucceeding digits of the desired number whereby additional series ofinterruptions are produced in the line to cause the successiveoperations of other automatic switches to complete the requiredconnection. 1t is understood that each time a digit is pulled on thedial, the paWl on the drum wheel is rotated past a corresponding numberot teeth on the ratchet wheel, so that the number of impulsestransmitted will in every case correspond to the digit called.

It will be seen from the foregoing that I have made radical changes andimprovements in calling devices of the general character described,whereby a calling device and a desk telephone are combined to form an,exceedingly compact and eilicient substation telephone set. Departuresmay be made from the exact structure disclosed, and I do not, therefore,wish to lilnit myself to the precise form shown in the drawings, b-utdesire rather to include and have protected by Letters Patent allmodifications of my invention which may hereafter be devised, limitedonly by the scope of the appended claims.

What I claim as my invention is:

1. In a substation telephone set, the combination with a rotary impulsesender, of a longitudinally movable setting member, and connecting meanswhereby said sender may be variably controlled through the medium ofsaid setting member.

2. In a substation telephone set, the combination with a rotary impulsesender, of a single setting member movable only in a strai ht line forvariably controlling said impu se sender,I and means for translating thelinear movement of said setting member into a. rotary movement of thesaid sender.

3. In a substation telephone set, a line circuit, a rotary device forinterrupting said circuit, and means Afor controlling said devicecomprising a longitudinally movable finger hole dial.

4. In a substation telephone set, a lino circuit, a spring controlledwheel, a single longitudinally movable setting member adapted whenoperated to rotate said wheel from its normal position against thetension. of its controlling spring, and an impulse sending devicevariably actuated by said Wheel on its return to normal to produceinterruptions in the said line circuit.

5. In a substation telephone set, the combination with a desk telephonehaving an upright tubular casing, ot a rotary impulse sender, and asetting member for said sender slidably mounted inside said casing.

6. In a substation telephone set, the combination with a desk telephonehaving an upright tubular casing, of a rotary impulse sender, and asetting member for said sender mounted inside said casing and having aseries of finger holds disposed on a line parallel thereto.

7. In a substation telephone set, the combination with a desk telephonehaving an upright tubular casing, of a rotary impulse sender, and asetting member for said sender movable on a line parallel lo the saidcasing.

8. In a substation telephone set, lthe combination with a desk telephonehaving an upright tubular casing, of a rotary impulse sender, a manuallyoperable controlling member for said sender disposed within the saidcasing, an opening in the casing in front of the said member, and lingerholds in the said member accessible through said opening.

9. In a substation telephone set, the coinbination with a desk telephonehaving a base and an upright frame, of an impulse sender in the base ofsaid telephone, and a setting member for said sender slidably mounted onsaid frame.

10. In a substation telephone set, the combination with a desk telephonehaving a base and an upright frame, of an impulse sender in the base ofsaid telephone, a setting member for said sender Slidably mounted onsaid frame, and means for communieating the movement of said settingmember to the said sender.

l1. In a substation telephone set, the combination with a desk telephonehaving a base and an upright frame, of an impulse sender in the base ofsaid telephone, a sliding setting member mounted on said frame, andmeans for controlling said sender through the medium of said settingmember.

12. In a substation telephone set, the combination with a desk telephonehaving a base and an upright frame, of an impulse sender in the base ofsaid telephone, a yn ianually operable setting member slidably IIiol'mtel on said frame, and mechanical. connecting means between thesaid setting member and the said sender.

13. In a substation telephone set, the combination with a rotary impulsesenderLof a setting member for said sender mounted independent thereof,and Yflexible connecting means lwhereby the said sender lmay Abecontrolled through the medium of said setting member.

y111. In a substation telephone set,`the`eon1 binatibn with a linecircuit, of a ,rotary iin- `pulse sender for producing nterrupti ns insaid 1i e, and an air controlled'speeegovernor igor lsaid sender.

15. In a substation telephone set` the combination with a line circuit,of a rotary im pulse sender for producing interruptions in said line,and a retarding device compris ing an air cylinder and piston forregulating the rate at which said interruptions are produced.

16. In a substation telephone set, the combination with a rotary impulsesendin device, of a manually operable contro ling Gopiel of tllm patentmyay be obtained for member therefor movable only in a .straight line,and lookin n'ieans for said controlling member control ed by thereceiver hook.

17. In a Calling device, a rotary impulse sending mechanism, and amanually operable controlling member provided with finger iqIlclsarranged in a straight line.

1 n a substation telephone set, a desk telephone having a base and anupright tubular casing, an impulse, sender within the said base, arectangular opening in the said casing, and a controlling member forsaid sender disposed within the said easing behind tlie said opening.

19. In a substationI telephone set, a desk telephone having a, base andan upright tubular casing, an impulse sender Within the said base, arectangular opening inthe said casing, a controlling member for saidsender disposed within the said casing behind the said opening, and aplurality of finger holds in the said controlling member.

Signed by 111e at Chicago, Cook county, 'i

State of Illinois, this 14th day of November, 1916.

JOHN G. BLESSING.

give `cents each, by addressing the Commissioner of Patents, Washington,D. 0. A I

